Battery input end polarity detection circuit of energy storage converter and energy storage converter
By using a voltage Hall sensor and a voltage comparator in the polarity detection circuit of the battery input terminal of the energy storage converter, the leakage current problem caused by insufficient electrical creepage distance is solved, and the functions of electrical isolation and battery polarity detection are realized.
Patent Information
- Application Number
- CN202323659577.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2033-12-29
AI Technical Summary
In the existing polarity detection circuit of the battery input terminal of the energy storage converter, the electrical creepage distance between the battery input terminal and the detection circuit is small, resulting in insufficient voltage and insulation distance, leakage current and even ignition.
The voltage Hall sensor and voltage comparator are used as the core components of the detection circuit. The high voltage input of the battery is converted into a low voltage through the voltage Hall sensor and compared with the reference voltage. The energy storage controller determines the polarity of the battery input based on the comparison results, and at the same time realizes electrical isolation between the battery cluster and the energy storage converter control circuit.
The electrical isolation between the battery cluster and the energy storage converter control circuit is realized, the electrical creepage distance between the battery input and the detection circuit is increased, leakage current and ignition are avoided, and electrical performance and insulation performance are ensured.
Smart Images
Figure CN222618698U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of power storage, and in particular to a polarity detection circuit for a battery input terminal of an energy storage converter and an energy storage converter. Background Art
[0002] The energy storage inverter is the core component of the electrochemical energy storage system, which realizes the mutual conversion of chemical energy of the energy storage battery of the power grid, or converts the chemical energy of the energy storage battery into electrical energy to supply the load. The positive and negative polarity outputs of the energy storage battery cluster are correctly connected to the positive and negative polarity inputs of the energy storage inverter in accordance with technical regulations, which is a basic requirement for the normal operation of the energy storage system. The energy storage inverter battery input polarity detection technology scheme is generally divided into two types, including a polarity detection circuit with a photocoupler as the core and a polarity detection circuit with a relay as the core. The first technical scheme uses the unidirectional conduction characteristics of the light-emitting diode and optical isolation technology, and the second technical scheme uses the forward voltage closing characteristics of the relay and magnetic isolation technology.
[0003] However, the electrical creepage distance between the battery input terminal and the detection circuit of the current technical solution is small, which will lead to insufficient voltage resistance and insulation distance. When performing electrical and insulation performance tests, there will be large leakage currents and even sparks.
[0004] It should be noted that the statements herein merely provide background information related to the present application and do not necessarily constitute prior art. Utility Model Content
[0005] In view of the above problems, the present application proposes an energy storage converter battery input terminal polarity detection circuit and an energy storage converter that overcome the above problems or at least partially solve the above problems.
[0006] The present application embodiment adopts the following technical solutions:
[0007] In a first aspect, an embodiment of the present application provides a polarity detection circuit for a battery input terminal of an energy storage inverter, characterized in that the detection circuit includes: a positive polarity input terminal, a negative polarity input terminal, an anti-reverse connection device, a voltage conversion module and a voltage comparison module, the positive polarity input terminal is connected to the positive polarity input terminal of the voltage conversion module through the anti-reverse connection device, the negative polarity input terminal is connected to the negative polarity input terminal of the voltage conversion module, and the output terminal of the voltage conversion module is connected to the voltage comparison module.
[0008] Preferably, the voltage conversion module includes a voltage Hall sensor, through which the high voltage of the battery is converted into a low voltage. The voltage comparison module includes a voltage comparator, and the positive polarity input end of the voltage comparator is connected to the output end of the voltage Hall sensor.
[0009] Preferably, the anti-reverse polarity device includes an anti-reverse polarity diode, and the detection circuit also includes: a first current limiting resistor and a second current limiting resistor, the input end of the first current limiting resistor is connected to the output end of the anti-reverse polarity diode, the output end of the first current limiting resistor is connected to the positive polarity input end of the voltage Hall sensor, the input end of the second current limiting resistor is connected to the negative polarity input terminal, and the output end of the second current limiting resistor is connected to the negative polarity input end of the voltage Hall sensor.
[0010] Preferably, the detection circuit further includes a third resistor, one end of which is grounded, and the other end is connected between the output end of the voltage Hall sensor and the positive polarity input end of the voltage comparator. The detection circuit further includes a fourth resistor, one end of which is connected to a reference voltage, and the other end is connected to the negative polarity input end of the voltage comparator.
[0011] Preferably, the detection circuit further includes an energy storage controller, and the energy storage controller controls the operation of the energy storage converter by judging the output terminal level of the voltage comparison module.
[0012] In a second aspect, an embodiment of the present application further provides an energy storage converter, comprising a detection circuit as described in any one of the first aspects.
[0013] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:
[0014] The present application uses a voltage Hall sensor and a voltage comparator as the core components of the detection circuit. The voltage Hall sensor converts the high voltage of the battery input into a low voltage and compares it with the reference voltage. The energy storage controller determines the polarity of the battery input based on the comparison result. The voltage Hall sensor realizes voltage conversion while forming electrical isolation between the battery input and the energy storage controller. At the same time, due to the large size of the voltage Hall sensor, the electrical creepage distance between the battery input terminal and the detection circuit becomes larger.
[0015] The above description of the technical solution of the present application is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:
[0017] Figure 1 This is a schematic diagram of a polarity detection circuit for a battery input terminal of an energy storage converter in an embodiment of the present application;
[0018] Figure 2 This is a circuit diagram of a polarity detection circuit for a battery input terminal of an energy storage converter in an embodiment of the present application; DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.
[0020] The idea of the present application is to design a highly universal energy storage inverter battery input polarity detection circuit in view of the current situation in which the detection circuit in the prior art is not ideal in achieving electrical isolation between the battery cluster and the energy storage inverter control circuit. The circuit is an energy storage inverter battery input polarity detection circuit with a voltage Hall sensor and a voltage comparator as core components. The detection circuit can accurately detect whether the positive and negative polarities of the battery cluster connected to the energy storage inverter meet the technical standards. At the same time, the detection circuit achieves electrical isolation between the battery cluster and the energy storage inverter control circuit.
[0021] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.
[0022] The embodiment of the present application provides a battery input terminal polarity detection circuit of an energy storage converter and an energy storage converter, such as Figure 1 As shown, a schematic diagram of a polarity detection circuit for the battery input terminal of an energy storage inverter in an embodiment of the present application is provided, wherein the detection circuit comprises: a positive polarity input terminal, a negative polarity input terminal, an anti-reverse connection device 210, a voltage conversion module 220, and a voltage comparison module 230, wherein the positive polarity input terminal is connected to the positive polarity input terminal of the voltage conversion module 220 through the anti-reverse connection device, the negative polarity input terminal is connected to the negative polarity input terminal of the voltage conversion module, and the output terminal of the voltage conversion module is connected to the voltage comparison module 230.
[0023] In the present application, the detection circuit is arranged in the energy storage inverter, and the detection circuit is connected to the battery cluster to detect whether the forward and reverse connection of the energy storage inverter is normal, and at the same time, electrical isolation is formed between the battery cluster and the energy storage inverter control circuit. The anti-reverse connection device in the present application uses the principle of forward conduction and reverse cutoff to realize unidirectional conduction of current; the voltage conversion module converts the high voltage of the battery cluster into the working voltage range of the energy storage inverter, and the voltage comparison module is used to compare the converted low voltage with the reference voltage to obtain the comparison result.
[0024] In some examples of the present application, the voltage conversion module includes a voltage Hall sensor, through which the high voltage of the battery is converted into a low voltage. The voltage comparison module includes a voltage comparator, and the positive polarity input end of the voltage comparator is connected to the output end of the voltage Hall sensor. The anti-reverse connection device includes an anti-reverse connection diode, and the detection circuit also includes: a first current limiting resistor and a second current limiting resistor, the input end of the first current limiting resistor is connected to the output end of the anti-reverse connection diode, the output end of the first current limiting resistor is connected to the positive polarity input end of the voltage Hall sensor, the input end of the second current limiting resistor is connected to the negative polarity input terminal, and the output end of the second current limiting resistor is connected to the negative polarity input end of the voltage Hall sensor. The detection circuit also includes a third resistor, one end of the third resistor is grounded, and the other end is connected between the output end of the voltage Hall sensor and the positive polarity input end of the voltage comparator. The detection circuit also includes a fourth resistor, one end of the fourth resistor is connected to the reference voltage, and the other end is connected to the negative polarity input end of the voltage comparator.
[0025] In this application, the meaning of positive connection of battery input is that the positive polarity output of the battery is connected to the positive polarity input of the energy storage inverter, and the negative polarity output of the battery is connected to the negative polarity input of the energy storage inverter. The meaning of reverse connection of battery input is that the positive polarity output of the battery is connected to the negative polarity input of the energy storage inverter, and the negative polarity output of the battery is connected to the positive polarity input of the energy storage inverter.
[0026] The output voltage (or level) of the voltage comparator output terminal means that when the positive input voltage of the voltage comparator is greater than the negative input voltage of the voltage comparator, the output voltage of the voltage comparator is V CC (or high level); when the positive input voltage of the voltage comparator is less than the negative input voltage of the voltage comparator, the output voltage of the voltage comparator is 0V (or low level).
[0027] Combined with Figure 2 The working principle of the polarity detection circuit at the battery input end of the energy storage converter is as follows:
[0028] When the battery input of the energy storage converter is connected in the forward direction, the anti-reverse diode D1 is forward-conducted, and the anti-reverse diode conduction voltage drop VD1 , current limiting resistor R1, current limiting resistor R2, voltage Hall sensor input side internal resistor R in The voltage is divided in series, and the current on the input side of the voltage Hall sensor is I in , Among them, the anti-reverse diode in the present application can be a germanium diode or a silicon diode, both of which have a relatively standard voltage drop. Generally speaking, the voltage drop of a silicon diode is 0.7v, and the voltage drop of a germanium diode is 0.3v.
[0029] The ratio of the output current to the input current of the voltage Hall sensor is N, where N voltage is the standard parameter of the Hall sensor. The output current of the voltage Hall sensor is I out , I out =N*I in ; The terminal voltage of the current-to-voltage resistor R3 is U R3 , U R3 =R3*I out ; At this time, the positive input voltage of the voltage comparator is V in+ Greater than the negative reference voltage V of the voltage comparator REF , where V REF The setting is generally 1 / 3U R3 --2 / 3U R3 The output level of the voltage comparator output terminal is high level.
[0030] When the battery input of the energy storage converter is reversely connected, the anti-reverse diode D1 is reversely cut off, and the battery voltage is fully applied to the anti-reverse diode. The current limiting resistor R1, the current limiting resistor R2, and the internal resistor R in The voltage applied is 0V, the current on the input side of the voltage Hall sensor is 0A; the current on the output side of the voltage Hall sensor is 0A, and the terminal voltage of the current-to-voltage resistor R3 is 0V; at this time, the positive input voltage V in+ Less than the negative reference voltage V of the voltage comparator REF , the output level of the voltage comparator output terminal is low level.
[0031] In some examples of the present application, the detection circuit further includes an energy storage controller, and the energy storage controller controls the operation of the energy storage converter by judging the output terminal level of the voltage comparison module.
[0032] In this application, the output voltage of the energy storage controller detecting the voltage comparator output terminal is V CC When the output voltage of the output terminal of the energy storage controller detection voltage comparator is 0V (or low level), the battery input is reversed.
[0033] It can be understood that the polarity detection circuit of the battery input terminal of the energy storage inverter in the present application can realize the positive and reverse connection of the battery cluster connected thereto, thereby protecting the energy storage inverter from damage caused by the battery cluster voltage during reverse connection; at the same time, due to the large size of the voltage Hall sensor, the present application applies the electrical isolation function between the input side and the output side of the voltage Hall sensor to form electrical isolation between the battery input terminal and the energy storage controller.
[0034] The present application also provides an energy storage inverter, including the detection circuit as described above, and the energy storage inverter can realize the various functions of the detection circuit provided in the aforementioned embodiments. Regarding other parts of the energy storage inverter, refer to the prior art and will not be repeated here.
[0035] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.
[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0037] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0038] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.
[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0040] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.
Claims
1. A polarity detection circuit for battery input terminal of energy storage converter, characterized in that: The detection circuit comprises: A positive polarity input terminal, a negative polarity input terminal, an anti-reverse connection device, a voltage conversion module and a voltage comparison module, wherein the positive polarity input terminal is connected to the positive polarity input end of the voltage conversion module through the anti-reverse connection device, the negative polarity input terminal is connected to the negative polarity input end of the voltage conversion module, and the output end of the voltage conversion module is connected to the voltage comparison module.
2. The detection circuit according to claim 1, characterized in that: The voltage conversion module includes a voltage Hall sensor, through which the high voltage of the battery is converted into a low voltage.
3. The detection circuit as claimed in claim 2, characterized in that: The voltage comparison module includes a voltage comparator, and a positive polarity input terminal of the voltage comparator is connected to an output terminal of the voltage Hall sensor.
4. The detection circuit as claimed in claim 3, characterized in that: The anti-reverse connection device includes an anti-reverse connection diode, and the detection circuit also includes: A first current limiting resistor and a second current limiting resistor, wherein the input end of the first current limiting resistor is connected to the output end of the anti-reverse connection diode, the output end of the first current limiting resistor is connected to the positive polarity input end of the voltage Hall sensor, the input end of the second current limiting resistor is connected to the negative polarity input terminal, and the output end of the second current limiting resistor is connected to the negative polarity input end of the voltage Hall sensor.
5. The detection circuit as claimed in claim 4, characterized in that: The detection circuit further includes a third resistor, one end of which is grounded, and the other end of which is connected between the output end of the voltage Hall sensor and the positive polarity input end of the voltage comparator.
6. The detection circuit as claimed in claim 4, characterized in that: The detection circuit further includes a fourth resistor, one end of which is connected to a reference voltage, and the other end of which is connected to a negative polarity input end of the voltage comparator.
7. The detection circuit according to claim 1, characterized in that: The detection circuit also includes an energy storage controller, which controls the operation of the energy storage converter by judging the output terminal level of the voltage comparison module.
8. An energy storage converter, characterized in that: Comprising a detection circuit as claimed in any one of claims 1-7.